I have a colony as well. But I dont think that there is any obvious way to sex them. I honestly cant tell the difference from one beetle to the other.
I was maintaining my colony and was really curious if there is a way to sex the beetles? I can see that some are larger than other, but not by much.
arent u suppose to sex the beetles? i mean the worm morph should b a nymph stage right?
Egg>Mealworm>Pupae>Beetle. Just throw them all in a container :\. No real way to sex them I guess.
I have noticed the penis, male part, (if that is what it is called in beetles) sticking out from under the back of the wings at the very end of the abdomen during mating or in old age in my beetles, but can not tell them apart otherwise.
It is a bit difficult but possible. Males have a little more curved front tibiae. With good stereoscopic microscope you can ID them... but why?
It is much easier to do this in Zophobas morio, where characteristic clypeus is visible. Here is the pic I took some time ago:
Male on the left, female on the right.
Cannibalism is normal among many darkling beetles. Give them more proteins.
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